Question

Differentiate between Endocytosis and Exocytosis.

Answer 1

Hint:
Endocytosis is a process of taking up materials into the cell and exocytosis is the process of giving up materials from the cell.

Complete answer:
Endocytosis:-
> It is the process by which cells take up substance from the external environment.
> In this a vesicle called endocytic vesicles get formed around the foreign substances.
> It occurs due to both phagocytosis and pinocytosis.
> In this internal vesicles are formed that are like phagosomes are formed
> The best known example is formation of food vacuole in amoeba.
> It is not involved in cell wall formation
> It involves transportation of macromolecules into the cell.
> At the end of this process the vesicle fuses with the membrane bound organelles.

Exocytosis:-
> It is the process by which cells give up substance to the external environment.
> In this the vesicle that is filled with water gets fused with plasma membrane.
> It occurs due to regulated secretory pathways.
> The vesicle that is secretory in nature gets formed.
> The best known example is the hormone release.
> It is involved in cell wall formation.
> It is involved in transportation of macromolecules out of the cell.
> At the end of this process the vesicle gets connected with the cell membrane.

Note:
Amoeba obtains its food with the help of finger-like projections called pseudopodia . It takes food by forming food vacuole around the food particle. Now the vacuole gets fused with the cell surface . The food gets inside the amoeba. Now the undigested food gets excreted out of the cell. This process is the best given example of endocytosis.